javascript - How to get selected combobox value and load its corresponding data in html form -

i have combobox loads value data base. want when user select value combobox form should load corresponding values database html form. here code trying:

<div class="col-lg-6" style="display:none"  id="c" >      <form id="aa" action=""   method="post"  >         <br><br><br>          <select name="id" id="id" class="span2" style=" width:150px;" onchange="this.form.submit();">             <?php                  $servername = "localhost";                 $username = "root";                 $password = "";                 $dbname = "valet";                  // create connection                 $conn = mysqli_connect($servername, $username, $password, $dbname);                 // check connection                 if (!$conn) {                     die("connection failed: " . mysqli_connect_error());                 }                 $arr = array();                  $sql = "select id tbl_user  ";                 $result = mysqli_query($conn, $sql);                     // echo "user name=" . $row["name"]. "<br>";             ?>             <option value="">-select user-</option>             <?php                            if (mysqli_num_rows($result) > 0) {                     // output data of each row                     while($row = mysqli_fetch_assoc($result)) {                         $arr[] = $row;                     }                      foreach($arr $key => $row){                         echo "<option value='".$row["id"]."'>".$row["id"]."</option>";                         $globals['a'] = $row["first_name"];                         $globals['b'] = $row["last_name"];                         $globals['c'] = $row["phone"];                         $globals['d'] =  $row["company_id"];                         $globals['e'] = $row["register_on"];                     }                 }                 else {                     echo "error: " . $sql . "<br>" . mysqli_error($conn);                     header('location: webservices.php');                 }                  mysqli_close($conn);             ?>         </select>          <br><br><br>         <input type="text" id="first_name" value="<?php $globals['a']  ?>" name="first_name" style="width: 460px;height: 50px;overflow: hidden;" placeholder="first name*">         <br><br><br><br>          <input type="text" id="last_name" value="<?php $globals['b']  ?>" name="last_name" style="width: 460px;height: 50px;overflow: hidden;" placeholder="last name*">         <br><br><br><br>         <input type="text" id="phone" value="<?php $globals['c']  ?>" name="phone" style="width: 460px;height: 50px;overflow: hidden;" placeholder="phone*">         <br><br><br><br>         <input type="text" id="company_id" value="<?php $globals['d']  ?>" name="company_id" style="width: 460px;height: 50px;overflow: hidden;" placeholder="company id*">         <br><br><br><br>         <input type="text" id="register_on" value="<?php $globals['e']  ?>" name="register_on" style="width: 460px;height: 50px;overflow: hidden;" placeholder="register on*">         <br><br><br><br>         <button name="edituser" id="edituser" type="submit" style="border:0;width:100px;margin-left: 45px;" >             <img src="images/save.png" alt="">         </button>         <button type="submit" style="border:0;width:100px;margin-left: 75px;">             <img src="images/cancel.png" alt="">         </button>     </form>  </div>  

please me how can accomplish task?

you can use jquery this. record marco mura did give solution problem. didn't want research problem , solve after solution given you.

$("#id").change(function(){     $.post("www.example.com?val=" + $(this).val(),function(response){         $("#mydiv").html(response);     }) })